/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.metadata.mnode;

import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.metadata.mtree.store.disk.cache.CacheEntry;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public abstract class MNode implements IMNode {

    /**
     * Name of the MNode
     */
    protected String name;

    protected IMNode parent;

    /**
     * from root to this node, only be set when used once for InternalMNode
     */
    protected String fullPath;

    protected CacheEntry cacheEntry;

    /**
     * Constructor of MNode.
     */
    public MNode(IMNode parent, String name) {
        this.parent = parent;
        this.name = name;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public IMNode getParent() {
        return parent;
    }

    @Override
    public void setParent(IMNode parent) {
        this.parent = parent;
    }

    /**
     * get partial path of this node
     *
     * @return partial path
     */
    @Override
    public PartialPath getPartialPath() {
        List<String> detachedPath = new ArrayList<>();
        IMNode temp = this;
        detachedPath.add(temp.getName());
        while (temp.getParent() != null) {
            temp = temp.getParent();
            detachedPath.add(0, temp.getName());
        }
        return new PartialPath(detachedPath.toArray(new String[0]));
    }

    /**
     * get full path
     */
    @Override
    public String getFullPath() {
        if (fullPath == null) {
            fullPath = concatFullPath();
        }
        return fullPath;
    }

    String concatFullPath() {
        StringBuilder builder = new StringBuilder(name);
        IMNode curr = this;
        while (curr.getParent() != null) {
            curr = curr.getParent();
            builder.insert(0, IoTDBConstant.PATH_SEPARATOR).insert(0, curr.getName());
        }
        return builder.toString();
    }

    @Override
    public void setFullPath(String fullPath) {
        this.fullPath = fullPath;
    }

    @Override
    public void moveDataToNewMNode(IMNode newMNode) {
        newMNode.setParent(parent);
        newMNode.setCacheEntry(cacheEntry);
    }

    @Override
    public boolean isUseTemplate() {
        return false;
    }

    @Override
    public boolean isStorageGroup() {
        return false;
    }

    @Override
    public boolean isEntity() {
        return false;
    }

    @Override
    public boolean isMeasurement() {
        return false;
    }

    @Override
    public IStorageGroupMNode getAsStorageGroupMNode() {
        if (isStorageGroup()) {
            return (IStorageGroupMNode) this;
        } else {
            throw new UnsupportedOperationException("Wrong MNode Type");
        }
    }

    @Override
    public IEntityMNode getAsEntityMNode() {
        if (isEntity()) {
            return (IEntityMNode) this;
        } else {
            throw new UnsupportedOperationException("Wrong MNode Type");
        }
    }

    @Override
    public IMeasurementMNode getAsMeasurementMNode() {
        if (isMeasurement()) {
            return (IMeasurementMNode) this;
        } else {
            throw new UnsupportedOperationException("Wrong MNode Type");
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        MNode mNode = (MNode) o;
        if (fullPath == null) {
            return Objects.equals(getFullPath(), mNode.getFullPath());
        } else {
            return Objects.equals(fullPath, mNode.getFullPath());
        }
    }

    @Override
    public int hashCode() {
        if (fullPath == null) {
            return Objects.hash(getFullPath());
        } else {
            return Objects.hash(fullPath);
        }
    }

    @Override
    public String toString() {
        return this.getName();
    }

    @Override
    public CacheEntry getCacheEntry() {
        return cacheEntry;
    }

    @Override
    public void setCacheEntry(CacheEntry cacheEntry) {
        this.cacheEntry = cacheEntry;
    }
}
